In the sub-TeV regime, most widely used hadronic interaction models disagree significant lying their predictions for post-first and ground-level particle spectra from cosmic ray induced air showers. These differences generate an important source of systematic uncertainty in experimental use. We investigate nature impact model uncertainties through a simultaneous analysis ground level particles ...

X iv :a st ro -p h/ 04 12 61 0v 1 2 3 D ec 2 00 4 KASCADE: Astrophysical results and tests of hadronic interaction models A. Haungs, T. Antoni, W.D. Apel, A.F. Badea, K. Bekk, A. Bercuci, H. Blümer, H. Bozdog, I.M. Brancus, C. Büttner, A. Chilingarian, K. Daumiller, P. Doll, R. Engel, J. Engler, F. Feßler, H.J. Gils, R. Glasstetter, D. Heck, J.R. Hörandel, K.-H. Kampert, H.O. Klages, G. Maier, ...

P. MOSKAL, H.-H. ADAM, A. BUDZANOWSKI, R. CZYŻYKIEWICZ, D. GRZONKA, M. JANUSZ, L. JARCZYK, B. KAMYS, A. KHOUKAZ, K. KILIAN, P. KLAJA, J. MAJEWSKI, W. OELERT, C. PISKOR–IGNATOWICZ , J. PRZERWA, T. ROŻEK, T. SEFZICK, M. SIEMASZKO, J. SMYRSKI, A. TÄSCHNER, P. WINTER, M. WOLKE, P. WÜSTNER, W. ZIPPER ∗ Nuclear Physics Department, Jagellonian University, Cracow, 30-059, Poland † Institut für Kernphys...

The Monte Carlo program CORSIKA simulates the 4-dimensional evolution of extensive air showers in the atmosphere initiated by photons, hadrons or nuclei. It contains links to the hadronic interaction models DPMJET, HDPM, NEXUS, QGSJET, SIBYLL, and VENUS. These codes are employed to treat the hadronic interactions at energies above 80 GeV. Since their first implementation in 1996 the models DPMJ...

In this research we described the effective Hamiltonian theory and applied this theory to the calculation of current-current (Q1,2) and QCD penguin (Q3,…,6) c quark decay rates. We calculated the decay rates of semileptonic and hadronic of charm quark in the effective Hamiltonian theory. We investigated the decay rates of D meson decays according to Spectator Quark Model (SQM) for the calculati...

Results presented in perturbative QCD are reviewed. The topics discussed include: struction functions, heavy flavour production, direct photon production, inclusive production at LHC/SSC, small x physics, QCD jets and intermittency. For reference to the data in this talk see the summary presented by J.E. Augustin. 1. Struction functions. New data on deep inelastic structure functions by NMC and...

We analyse a sample of 33 extensive air showers (EAS) with estimated primary energies above 2·1019 eV and high-quality muon data recorded by the Yakutsk EAS array. We compare, event-by-event, the observed muon density to that expected from CORSIKA simulations for primary protons and iron, using SIBYLL and EPOS hadronic interaction models. The study suggests the presence of two distinct hadronic...